Optical adjustment device, lens assembly and electronic equipment

Abstract

The utility model provides an optical adjusting device, a lens assembly and electronic equipment. The optical adjusting device comprises a first adjusting part and a second adjusting part, the first adjusting part comprises a first reflecting surface and a second reflecting surface, the second adjusting part comprises a third reflecting surface and a fourth reflecting surface, and the first adjusting part is movably arranged relative to the second adjusting part; the optical adjusting device is configured to achieve focusing or zooming of the lens assembly by adjusting the position of the first adjusting piece relative to the second adjusting piece. The optical adjusting device is simple in structure, single in movement mode, low in cost and relatively low in technical threshold, focusing and zooming can be completed only by adjusting the positions of the two reflecting surfaces in the first adjusting part, and accumulated errors caused by multi-part transmission are completely avoided. In addition, the optical adjusting device can be independently stripped from the lens assembly, so that independent devices are realized, and the optical adjusting device is not influenced by the lens during design and production.

Description

Technical Field

[0001] This disclosure relates to the field of lens technology, and more particularly to an optical adjustment device, lens assembly, and electronic device. Background Technology

[0002] In related technologies, the focusing and zooming solutions for lens components generally employ STM (Synchronous Transmission Mechanism). Step motor， This can be achieved using a stepper motor or a USM (ultrasonic motor).

[0003] When using STM for focusing or zooming, gear transmission drives the lens assembly in linear motion, thus achieving focusing and zooming. However, STM itself has precision errors, gear transmission has machining and meshing errors, and there are dimensional and fitting errors between moving and non-moving parts of the lens assembly. In other words, when using STM for focusing or zooming, the large number of components involved in the motion transmission process leads to accumulated errors, resulting in significant overall system errors and inaccurate focusing and zooming.

[0004] When using a USM (Unstable Unseen Mass) for focusing or zooming, the inverse piezoelectric effect is utilized to create a ring-shaped or linear USM. The USM is then used to move the lens or lens components to focus or zoom. However, since the USM uses friction to generate relative motion, long-term wear and tear can lead to a decrease in accuracy. Furthermore, this method also requires gear transmission, which can result in accumulated errors.

[0005] Therefore, it can be seen that the focusing and zooming in the relevant technologies suffer from poor accuracy due to the large number of components involved in the motion transmission process. Utility Model Content

[0006] In view of this, in order to solve the technical problem of poor accuracy in both focusing and zooming due to too many components involved in the motion transmission process, this disclosure provides an optical adjustment device, a lens assembly, and an electronic device.

[0007] According to a first aspect of the present disclosure, an optical adjustment device is provided for use in a lens assembly. The optical adjustment device includes a first adjustment member and a second adjustment member. The first adjustment member includes a first reflective surface and a second reflective surface. The second adjustment member includes a third reflective surface and a fourth reflective surface. The first adjustment member is movably disposed relative to the second adjustment member. The first reflective surface and the second reflective surface are perpendicular to each other. The first reflective surface and the third reflective surface are parallel to each other. The second reflective surface and the fourth reflective surface are parallel to each other. The right angle formed by the intersection of the first reflective surface and the second reflective surface is denoted as the first right angle. The right angle formed by the intersection of the third reflective surface and the fourth reflective surface is denoted as the second right angle. The bisector of the first right angle coincides with the bisector of the second right angle.

[0008] The optical adjusting device is configured to realize focusing or zooming of the lens assembly by adjusting the position of the first adjusting member relative to the second adjusting member along the bisector of the first right angle.

[0009] The optical adjusting device is configured to realize focusing or zooming of the lens assembly by adjusting the position of the first adjusting member relative to the second adjusting member along the bisector of the first right angle.

[0010] In an optional embodiment,

[0011] The first adjusting member comprises a first plane mirror and a second plane mirror perpendicular to each other, one side of the first plane mirror facing the third reflecting surface constitutes the first reflecting surface, and one side of the second plane mirror facing the fourth reflecting surface constitutes the second reflecting surface.

[0012] In an optional embodiment,

[0013] The second adjusting member comprises a right-angle prism, one side of the right-angle prism parallel to the first reflecting surface and facing the first reflecting surface constitutes the third reflecting surface, and one side of the right-angle prism parallel to the second reflecting surface and facing the second reflecting surface constitutes the fourth reflecting surface.

[0014] In an optional embodiment,

[0015] The optical adjusting device comprises a driving device for driving the first adjusting member to move relative to the second adjusting member along the bisector of the first right angle.

[0016] In an optional embodiment,

[0017] The driving device is any one of the following: an electromagnetic driving device, an ultrasonic motor driving device, a piezoelectric driving device, and a shape memory alloy driving device.

[0018] In an optional embodiment,

[0019] When the driving device is an electromagnetic driving device, the electromagnetic driving device is any one of the following: a spring piece type electromagnetic driving device, a ball type electromagnetic driving device, and a sliding rod type electromagnetic driving device.

[0020] In an optional embodiment,

[0021] The optical adjustment device comprises a closed-loop feedback system configured to realize focusing or zooming of the lens assembly by controlling a position adjustment process of the first adjustment member relative to the second adjustment member along a bisector of the first right angle.

[0022] In an optional embodiment,

[0023] The closed-loop feedback system comprises a sensor and a controller electrically connected with the sensor.

[0024] The sensor is configured to detect displacement information and position information of the first adjustment member relative to the second adjustment member along a bisector of the first right angle.

[0025] The controller is configured to control a position adjustment process of the first adjustment member relative to the second adjustment member along a bisector of the first right angle based on the displacement information and the position information detected by the sensor.

[0026] According to a second aspect of the embodiments of the present disclosure, a lens assembly is provided, comprising an imaging element and a fixed-focus lens group, wherein,

[0027] The imaging element and the fixed-focus lens group are provided with an optical adjustment device as any one of the first aspect, which is referred to as a first optical adjustment device, and the first optical adjustment device realizes focusing of the lens assembly by adjusting a position of the first adjustment member relative to the second adjustment member along a bisector of the first right angle.

[0028] And / or,

[0029] The fixed-focus lens group comprises a first lens and a second lens, and the first lens and the second lens are provided with an optical adjustment device as any one of the first aspect, which is referred to as a second optical adjustment device, and the second optical adjustment device realizes zooming of the lens assembly by adjusting a position of the first adjustment member relative to the second adjustment member along a bisector of the first right angle.

[0030] According to a third aspect of the embodiments of the present disclosure, an electronic device is provided, and the electronic device comprises the lens assembly as the second aspect.

[0031] The technical scheme provided by the embodiment of the present disclosure can have the following beneficial effects: the optical adjustment device of the present disclosure can include a first adjustment member and a second adjustment member, when the optical adjustment device is arranged between an imaging element and a fixed focus lens group, the position of the first adjustment member relative to the second adjustment member can be adjusted, so that the positions of the two reflecting surfaces in the first adjustment member relative to the two reflecting surfaces in the second adjustment member are changed, so that the object distance is changed, and focusing is achieved; when the optical adjustment device is arranged between two lenses in the fixed focus lens group, the position of the first adjustment member relative to the second adjustment member can be adjusted, so that the positions of the two reflecting surfaces in the first adjustment member relative to the two reflecting surfaces in the second adjustment member are changed, so that the focal length is changed, and zooming is achieved. The optical adjustment device in the present disclosure has simple structure, single movement mode, low cost, and relatively low technical threshold, and focusing and zooming can be completed by adjusting the positions of the two reflecting surfaces in the first adjustment member, so that cumulative errors caused by multi-component transmission are completely avoided. In addition, the optical adjustment device of the present disclosure can be separated from the lens assembly, so that the device is realized independently, and the design and production are not affected by the lens itself.

[0032] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced as follows, and obviously, other drawings can be obtained by those skilled in the art without creative labor under the premise of not paying the creative labor.

[0035] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings, and these exemplary illustrations do not constitute a limitation on the embodiments, and the elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified, and the drawings do not constitute a proportional limitation.

[0036] Figure 1 is a schematic view of a lens assembly according to an exemplary embodiment.

[0037] Figure 2 is a schematic view of a first adjustment device according to an exemplary embodiment.

[0038] Figure 3 is a schematic view of a second adjustment device according to an exemplary embodiment.

[0039] Figure 4 is a schematic view of a lens assembly according to another exemplary embodiment.

[0040] Figure 5 is a partial schematic view of a lens assembly according to another exemplary embodiment.

[0041] Reference Signs

[0042] 10 imaging element

[0043] 20 fixed focus lens group; 21 first lens; 22 second lens

[0044] 30 optical adjustment means; 31 first adjustment means; 311 first reflecting surface; 312 second reflecting surface; 32 second adjustment means; 321 third reflecting surface; 322 fourth reflecting surface

[0045] 40 screen DETAILED DESCRIPTION

[0046] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0047] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplifying the present application, the components and settings of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and it does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but a person of ordinary skill in the art can realize the applicability of other processes and / or the use of other materials.

[0048] For ease of description, spatial relative terms can be used herein to describe the relative position relationship or movement condition of one element or feature with respect to another element or feature as shown in the drawings, such as "inner", "outer", "inboard", "outboard", "under", "below", "on", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over or reversed, or the state of motion is changed, the directional indications will also change accordingly, for example: the element described as "under" or "below" another element or feature will be subsequently oriented as "above" or "above" another element or feature. Therefore, the example term "below" can include both upward and downward positions. The device can be additionally oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are interpreted accordingly.

[0049] To solve the technical problems of poor precision caused by too many components associated with the motion transmission process in both focusing and zooming, the present disclosure provides an optical adjustment device and a lens assembly.

[0050] The optical adjustment device of the present disclosure can include a first adjustment member and a second adjustment member 32. When the optical adjustment device is arranged between the imaging element and the fixed focus lens group, the position of the first adjustment member relative to the second adjustment member 32 can be adjusted to change the position of the two reflecting surfaces in the first adjustment member relative to the two reflecting surfaces in the second adjustment member 32, thereby changing the object distance and achieving focusing. When the optical adjustment device is arranged between the two lenses in the fixed focus lens group, the position of the first adjustment member relative to the second adjustment member 32 can be adjusted to change the position of the two reflecting surfaces in the first adjustment member relative to the two reflecting surfaces in the second adjustment member 32, thereby changing the focal length and achieving zooming. The optical adjustment device in the present disclosure has a simple structure, a single motion mode, low cost, and relatively low technical threshold. Moreover, focusing and zooming can be completed by adjusting the position of the two reflecting surfaces in the first adjustment member, completely avoiding the cumulative error caused by multiple component transmissions. In addition, the optical adjustment device of the present disclosure can be separated from the lens assembly to realize independent device design and production, which is not affected by the lens itself.

[0051] Reference Figures 1 to 3 As shown, in one exemplary embodiment, an electronic device, a lens assembly and an optical adjustment device 30 thereof are provided. The optical adjustment device 30 can be applied to the lens assembly, and the lens assembly can be applied to the electronic device. The electronic device can be a video camera or a camera, or other devices with video and / or photographing functions (such as a mobile phone or a computer), which are not limited.

[0052] The optical adjustment device 30 may include a first adjustment member 31 and a second adjustment member 32. The first adjustment member 31 includes a first reflective surface 311 and a second reflective surface 312, and the second adjustment member 32 includes a third reflective surface 321 and a fourth reflective surface 322. The first adjustment member 31 is movably set relative to the second adjustment member 32.

[0053] In the optical adjustment device, the first reflecting surface 311 and the second reflecting surface 312 are perpendicular to each other, the first reflecting surface 311 and the third reflecting surface 321 are parallel to each other, and the second reflecting surface 312 and the fourth reflecting surface 322 are parallel to each other, meaning the third reflecting surface 321 and the fourth reflecting surface 322 are also perpendicular to each other. The right angle formed by the intersection of the first reflecting surface 311 and the second reflecting surface 312 is denoted as the first right angle, and the right angle formed by the intersection of the third reflecting surface 321 and the fourth reflecting surface 322 is denoted as the second right angle. The bisector of the first right angle coincides with the bisector of the second right angle. Thus, the transmission of the aforementioned light can be achieved. Based on this, the light is transmitted along the optical axis (the optical axis refers to the center line of the light beam (light column), or the axis of symmetry of the optical system. In this embodiment, the optical axis refers to...). Figure 1 The beam, which is transmitted laterally, is transmitted to the first reflecting surface 311 in the direction of the center line (as shown). After being reflected by the first reflecting surface 311, it is transmitted to the third reflecting surface 321. After being reflected by the third reflecting surface 321, it is transmitted to the fourth reflecting surface 322. After being reflected by the fourth reflecting surface 322, it is transmitted to the second reflecting surface 312. After being reflected by the second reflecting surface 312, it is transmitted along the optical axis.

[0054] It should be noted that, since the first reflecting surface 311 and the second reflecting surface 312 are perpendicular to each other, and the third reflecting surface 321 and the fourth reflecting surface 322 are perpendicular to each other, in this optical adjustment device 30, the light rays transmitted along the optical axis to the first reflecting surface 311 are reflected by the first reflecting surface 311 and then transmitted along the optical axis to the third reflecting surface 321. After being reflected by the third reflecting surface 321, the light rays are transmitted along the optical axis to the fourth reflecting surface 322. After being reflected by the fourth reflecting surface 322, the light rays are transmitted along the optical axis to the second reflecting surface 312. After being reflected by the second reflecting surface 312, the light rays continue to be transmitted along the optical axis.

[0055] For example, refer to Figures 1 to 3As shown, when the optical adjustment device 30 is arranged between the imaging element 10 (DMD (Digital Micromirror Device) / LCD (Liquid Crystal Display)) and the fixed focus lens group 20 (i.e. an assembly composed of a fixed focus lens, which can include at least one fixed focus lens (LENS)) of the lens assembly, the light rays emitted from the imaging element 10 can be transmitted along the optical axis direction of the lens assembly to the first reflecting surface 311, transmitted to the third reflecting surface 321 after being reflected by the first reflecting surface 311, transmitted to the fourth reflecting surface 322 after being reflected by the third reflecting surface 321, transmitted to the second reflecting surface 312 after being reflected by the fourth reflecting surface 322, and transmitted to the fixed focus lens group 20 along the optical axis direction after being reflected by the second reflecting surface 312.

[0056] For another example, referring to FIG. 3, Figures 2 to 5 As shown, when the optical adjustment device 30 is arranged between the first lens 21 and the second lens 22 of the fixed focus lens group 20 of the lens assembly, the light rays emitted from the first lens 21 can be transmitted along the optical axis direction of the lens assembly to the first reflecting surface 311, transmitted to the third reflecting surface 321 after being reflected by the first reflecting surface 311, transmitted to the fourth reflecting surface 322 after being reflected by the third reflecting surface 321, transmitted to the second reflecting surface 312 after being reflected by the fourth reflecting surface 322, and transmitted to the second lens 22 along the optical axis direction after being reflected by the second reflecting surface 312.

[0057] In some embodiments, the optical adjustment device is configured to adjust the focus or zoom of the lens assembly by adjusting the position of the first adjustment member 31 relative to the second adjustment member 32 along the direction of the bisector of the first right angle.

[0058] In some embodiments, the optical adjustment device is configured to adjust the focus or zoom of the lens assembly by adjusting the position of the first adjustment member 31 relative to the second adjustment member 32 along the direction of the bisector of the first right angle.

[0059] For another example, referring to FIG. 3, Figures 1 to 3 As shown, the lens assembly can include an imaging element 10 and a fixed focus lens group 20, and the optical adjustment device 30 is located between the imaging element 10 and the fixed focus lens group 20. In this embodiment, the first adjustment member 31 and the second adjustment member 32 can be arranged along the vertical direction, i.e. the bisector of the first right angle extends along the vertical direction. In this embodiment, the propagation path of the light rays in the optical adjustment device 30 is changed by adjusting the position of the first adjustment member 31 relative to the second adjustment member 32 along the vertical direction, so as to adjust the object distance and achieve the focus of the lens assembly. For example, when it is necessary to increase the object distance, the first adjustment member 31 is driven to move relative to the second adjustment member 32 in a certain direction, so that the path of the light rays after reflection is changed, and thus the object distance of the final imaging is changed; conversely, when it is necessary to decrease the object distance, the first adjustment member 31 is driven to move in the opposite direction.

[0060] The design of the lens assembly in this embodiment can realize the focusing function without moving the imaging element 10 and the fixed focus lens group 20, only by adjusting the position of the first adjusting element 31 relative to the second adjusting element 32 along the bisector of the first right angle in the internal optical adjusting device 30, which provides a new idea and method for the design and application of optical lenses.

[0061] In some embodiments,

[0062] Referring to Figures 2 to 5 As shown in the figure, the lens assembly can include an imaging element 10 and a fixed focus lens group 20, which can be two fixed focus lenses, respectively denoted as a first lens 21 and a second lens 22. The optical adjusting device 30 is located between the first lens 21 and the second lens 22. In this embodiment, by precisely adjusting the position of the first adjusting element 31 relative to the second adjusting element 32 along the bisector of the first right angle, the propagation path of light in the optical adjusting device 30 is changed, and then the focal length is adjusted to realize the zoom function of the lens assembly. For example, when it is necessary to increase the focal length, the first adjusting element 31 is moved relative to the second adjusting element 32 in a certain direction, the light propagation path is changed, so that the overall focal length is increased; when it is necessary to decrease the focal length, the first adjusting element 31 is moved in the opposite direction.

[0063] The design of the lens assembly in this embodiment can realize the zoom function without moving the imaging element 10 and the fixed focus lens group 20, only by adjusting the position of the first adjusting element 31 relative to the second adjusting element 32 in the internal optical adjusting device 30, which provides a new idea and method for the design and application of optical lenses.

[0064] It should be noted that the fixed focus lens group 20 can also include more fixed focus lenses, and any two adjacent fixed focus lenses can be denoted as the first lens 21 and the second lens 22, and the optical adjusting device 30 can be arranged between them to realize the zoom function. The number of fixed focus lenses in the fixed focus lens group 20 and the number of optical adjusting devices 30 in the lens assembly can be set according to actual needs, which is not limited.

[0065] The optical adjusting device 30 in this embodiment has a simple structure, a single movement mode, low cost, and relatively low technical threshold. When it is applied to a lens assembly, focusing and zooming can be completed only by adjusting the positions of the two reflecting surfaces in the first adjusting element 31, completely avoiding the cumulative error caused by multi-component transmission. In addition, the optical adjusting device 30 in this embodiment can be separated from the lens assembly to realize independent device, and is not affected by the lens itself during design and production.

[0066] The first adjusting member 31 can include a first plane mirror and a second plane mirror perpendicular to each other, one side of the first plane mirror facing the third reflecting surface 321 constitutes the first reflecting surface 311, and one side of the second plane mirror facing the fourth reflecting surface 322 constitutes the second reflecting surface 312. That is, the reflecting surface of the first plane mirror faces the third reflecting surface 321 as the first reflecting surface 311. The reflecting surface of the second plane mirror faces the fourth reflecting surface 322 as the second reflecting surface 312.

[0067] The second adjusting member 32 can include a right-angle prism, one side of the right-angle prism parallel to and facing the first reflecting surface 311 constitutes the third reflecting surface 321, and one side of the right-angle prism parallel to and facing the second reflecting surface 312 constitutes the fourth reflecting surface 322. For example, the first reflecting surface of the right-angle prism faces the first reflecting surface 311 as the third reflecting surface 321. The second reflecting surface of the right-angle prism faces the second reflecting surface 312 as the fourth reflecting surface 322.

[0068] That is, in this embodiment, the reflecting surface of the first plane mirror is arranged opposite to the first reflecting surface of the right-angle prism, and the reflecting surface of the second plane mirror is arranged opposite to the second reflecting surface of the right-angle prism.

[0069] In some embodiments,

[0070] The first plane mirror and the second plane mirror can be made of high-reflectivity optical glass material, such as quartz glass, which has high reflectivity and good optical stability in the visible and near-infrared light wave bands. The right-angle prism can be processed by a precision machining process to ensure that the flatness and perpendicularity errors of the two right-angle surfaces (the third reflecting surface 321 and the fourth reflecting surface 322) are within a very small range (for example, less than 0.01 degrees).

[0071] It should be noted that, in actual application, the light is transmitted in the optical adjusting device 30 according to the specific reflection path described above. Assuming that the intensity of the light transmitted to the first reflecting surface 311 is a certain value, during the reflection process of each reflecting surface, due to the high reflectivity of the reflecting surface (for example, the reflectivity can reach more than 95%), the light loss is very small, which ensures the high efficiency of light transmission.

[0072] In an exemplary embodiment, referring to Figures 1 to 3 It is shown that an electronic device, a lens assembly, and an optical adjusting device 30 thereof are provided. The lens assembly can include an imaging element 10 and a fixed-focus lens group 20. The optical adjusting device 30 is arranged between the imaging element 10 and the fixed-focus lens group 20, and the optical adjusting device 30 adjusts the position of the first adjusting member 31 relative to the second adjusting member 32 along the bisector of the first right angle to achieve focusing of the lens assembly.

[0073] The first adjusting member 31 can include two plane mirrors, respectively referred to as a first plane mirror and a second plane mirror. The second adjusting member 32 can include a right-angle prism. The two plane mirrors change the object distance by moving in the vertical direction (also referred to as the up-down direction) in the optical path shown in FIG. 1, thereby achieving the focusing purpose. Figure 1 The first adjusting member 31 can include two plane mirrors, respectively referred to as a first plane mirror and a second plane mirror. The second adjusting member 32 can include a right-angle prism. The two plane mirrors change the object distance by moving in the vertical direction (also referred to as the up-down direction) in the optical path shown in FIG. 1, thereby achieving the focusing purpose.

[0074] The optical adjusting device 30 can include a driving device for driving the movement of the first adjusting member 31 relative to the second adjusting member 32. The driving device can be an electromagnetic driving device, an ultrasonic motor driving device, a piezoelectric driving device, or a shape memory alloy (SMA) driving device, without limitation. When the driving device is an electromagnetic driving device, the electromagnetic driving device can be a spring piece type electromagnetic driving device, a ball type electromagnetic driving device, or a sliding rod type electromagnetic driving device, without limitation.

[0075] That is, the movement of the two plane mirrors can be electromagnetic driving (including spring piece type, ball type, and sliding rod type), ultrasonic motor driving, piezoelectric driving, or SMA driving. The position of the imaging element 10 can be fixed, the focal length of the fixed-focus lens group 20 can be fixed, or the position can also be fixed. The focusing process can be achieved only by driving the two plane mirrors to move relative to the right-angle prism by the driving device, completely avoiding the cumulative error caused by multi-mechanism transmission.

[0076] When the driving device is a spring piece type electromagnetic driving device, the technical implementation difficulty is low, the cost is low, and the service life is long. At the same time, the optical adjusting device 30 can be a separate device, which is not affected by the lens assembly itself during design and production.

[0077] In this embodiment, the relationship between the imaging element 10, the optical adjusting device 30, the fixed-focus lens group 20, and the screen 40 is shown in the following formula: 1 / f = 1 / u + 1 / v. Wherein, f is the focal length; u is the object distance; v is the image distance. According to the above formula, when the two plane mirrors move synchronously up and down, the transmission distance L1+L3+L5 of the light along the optical axis direction (i.e., the left-right direction in FIG. 1) does not change, and the transmission distance (i.e., the up-down direction in FIG. 1) of the light along the direction perpendicular to the optical axis direction L2+L4 changes, that is, the object distance u changes, thereby achieving the focusing purpose. Figure 1 In this embodiment, the relationship between the imaging element 10, the optical adjusting device 30, the fixed-focus lens group 20, and the screen 40 is shown in the following formula: 1 / f = 1 / u + 1 / v. Wherein, f is the focal length; u is the object distance; v is the image distance. According to the above formula, when the two plane mirrors move synchronously up and down, the transmission distance L1+L3+L5 of the light along the optical axis direction (i.e., the left-right direction in FIG. 1) does not change, and the transmission distance (i.e., the up-down direction in FIG. 1) of the light along the direction perpendicular to the optical axis direction L2+L4 changes, that is, the object distance u changes, thereby achieving the focusing purpose. Figure 1 In this embodiment, the relationship between the imaging element 10, the optical adjusting device 30, the fixed-focus lens group 20, and the screen 40 is shown in the following formula: 1 / f = 1 / u + 1 / v. Wherein, f is the focal length; u is the object distance; v is the image distance. According to the above formula, when the two plane mirrors move synchronously up and down, the transmission distance L1+L3+L5 of the light along the optical axis direction (i.e., the left-right direction in FIG. 1) does not change, and the transmission distance (i.e., the up-down direction in FIG. 1) of the light along the direction perpendicular to the optical axis direction L2+L4 changes, that is, the object distance u changes, thereby achieving the focusing purpose.

[0078] The optical adjusting device 30 of this embodiment can also be provided with a closed-loop feedback system (not shown in the figure) to improve the focusing speed and focusing accuracy. The closed-loop feedback system can be a PID system or other systems, without limitation.

[0079] For a PID system, when the drive unit drives the two plane mirrors along the direction of the bisector of the first right angle (i.e., Figure 1 When the two plane mirrors move a certain displacement (as shown in the up-down direction), theoretically, the drive signal of the drive device has a specific relationship with the displacement, but in reality, other external factors can cause the movement to be imprecise. Therefore, it is not possible to accurately determine the specific displacement and the specific position after the movement. Thus, a sensor for real-time motion detection can be set in the PID system. This sensor can detect the displacement and position information of the first adjusting member 31 relative to the second adjusting member 32 along the bisector of the first right angle, that is, detect the actual displacement and position of the two plane mirrors after the movement. This detected displacement and position information is then fed back to the corresponding controller (also called a processor).

[0080] The controller can control the position adjustment process of the first adjusting member 31 relative to the second adjusting member 32 along the direction of the bisector of the first right angle based on the displacement and position information detected by the sensor. That is, the controller can adjust the drive signal according to the pre-set displacement correspondence so that the movement of the two plane mirrors reaches the pre-set amount. By repeatedly detecting and adjusting in this way, the displacement and position can be accurately reached to the predetermined value, thereby achieving precise focusing.

[0081] In this embodiment, a closed-loop feedback system, such as a PID system, enables real-time detection and adjustment of the plane mirror's position, avoiding motion errors caused by external factors and significantly improving focusing accuracy. Furthermore, the unique optical adjustment device 30 design and efficient driving method of this embodiment allow for rapid response during focusing, reducing the time required for focusing. Additionally, the positions of the imaging element 10 and the fixed-focus lens group 20 in this embodiment can be fixed; focusing can be achieved simply by adjusting the positions of the two plane mirrors relative to the right-angle prism, avoiding the complex structure and accumulated errors caused by multi-mechanism transmissions.

[0082] Moreover, the optical adjustment device 30 in this embodiment can be manufactured as a separate device, and is not limited by the lens assembly itself during the design and production process, which improves the flexibility of design and production efficiency.

[0083] Furthermore, when this embodiment employs methods such as spring-loaded electromagnetic drive, it offers advantages in terms of low cost and long lifespan, reducing the production and maintenance costs of the lens assembly. Moreover, in this driving method, displacement is a continuous process, and displacement is directly proportional to current. As long as the driving current is sufficiently finely divided, the displacement accuracy can also be sufficiently small, eliminating issues of backlash and homing errors. If a closed-loop feedback system is added, the accuracy will be even higher.

[0084] If the driving mode is a ball type electromagnetic drive or a slide rod type electromagnetic drive, the required driving precision can be better ensured after introducing a closed loop feedback system. If the driving mode is an ultrasonic motor drive or a piezoelectric drive, the displacement precision can reach the nanometer level due to the principle characteristics of ultrasonic waves and piezoelectricity, so it can be completely applied to the precision requirement of microns for focusing and zooming, and the precision of focusing and zooming can be better ensured. If the driving mode is a shape memory alloy drive, the displacement precision is micron level, and the closed loop control can be completed by itself, so the precision requirement can be met.

[0085] In one example embodiment, referring to Figures 2 to 5 An electronic device, a lens assembly and an optical adjusting device 30 thereof are provided, the lens assembly can include an imaging element 10 and a fixed focus lens group 20. The fixed focus lens group 20 can include at least two fixed focus lenses, and the two adjacent fixed focus lenses can be respectively denoted as a first lens 21 and a second lens 22. An optical adjusting device 30 is arranged between the first lens 21 and the second lens 22, and the optical adjusting device 30 adjusts the position of a first adjusting element 31 relative to a second adjusting element 32 in the direction of the bisector of the first right angle, so as to realize zooming of the lens assembly.

[0086] The first adjusting element 31 can include two plane mirrors, which are respectively denoted as a first plane mirror and a second plane mirror. The second adjusting element 32 can include a right-angle prism.

[0087] The optical adjusting device 30 can include a driving device for driving the movement of the first adjusting element 31 relative to the second adjusting element 32 in the direction of the bisector of the first right angle. The driving device can include a magnetic driving device, an ultrasonic motor driving device, a piezoelectric driving device, or a shape memory alloy (SMA) driving device, which is not limited. The electromagnetic driving device can include a spring piece type electromagnetic driving device, a ball type electromagnetic driving device, or a slide rod type electromagnetic driving device, which is not limited.

[0088] That is, the movement of the two plane mirrors can be electromagnetic driving (including spring piece type, ball type and slide rod type), ultrasonic motor driving, piezoelectric driving, or SMA driving. If it is a spring piece type electromagnetic drive, the technical implementation difficulty is low, the cost is low, and the service life is long. At the same time, the optical adjusting device 30 can be designed as a separate device, and the design and production are not affected by the lens assembly itself.

[0089] In this embodiment, the position of the imaging element 10 can be fixed, and the focal lengths of the first lens 21 and the second lens 22 can be fixed, and the positions can also be fixed. This embodiment changes the distance between the optical centers of the first lens 21 and the second lens 22 by the up-down movement of the two plane mirrors, and then changes the equivalent focal length of the entire lens assembly, so as to realize zooming.

[0090] This embodiment only has one-dimensional movement of the two plane mirrors in the up-down direction, completely avoids the cumulative error caused by the simultaneous movement of multiple components in the traditional way, and can greatly improve the zooming precision.

[0091] In this lens assembly, the distance d between the optical centers of the first lens 21 and the second lens 22 is d=D1+D2+D3+D4+D5+D6+D7. In addition, in this lens assembly,

[0092] f1 and f2 are the focal lengths of the two lenses (positive for convex and negative for concave), and d is the distance between the optical centers of the two lenses, then

[0093]

[0094] Where f is the equivalent focal length of the first lens 21, the optical adjustment device 30, and the second lens 22.

[0095] From the above formula, when the two plane mirrors move up and down, the value of D1+D2+D4+D6+D7 does not change, the value of D3+D5 changes, that is, the value of d changes, and then the focal length of the entire lens assembly also changes, that is, zooming.

[0096] Where the basic characteristics of the right-angle prism and the plane mirror are the same as the focusing scheme, which will not be repeated here.

[0097] Similarly, the zooming scheme of this embodiment can also introduce a closed-loop control system (such as a PID system), and the specific control logic will not be repeated.

[0098] In this embodiment, through the closed-loop feedback system such as the PID system, the position of the plane mirror can be detected and adjusted in real time, avoiding the movement error caused by external factors, and greatly improving the zooming precision. Moreover, the unique design of the optical adjustment device 30 and the efficient driving mode of this embodiment enable fast response during zooming, reducing the time required for zooming. In addition, the positions of the imaging element 10 and the fixed-focus lens assembly 20 in this embodiment can be fixed, and only the positions of the two plane mirrors relative to the right-angle prism need to be adjusted to realize zooming, avoiding the complex structure and cumulative error caused by multiple mechanism transmissions.

[0099] The embodiment has the advantages of low cost and long service life when using a spring piece type electromagnetic drive or the like, thereby reducing the production cost and maintenance cost of the lens assembly. The optical adjustment device 30 can be a separate device, and is not limited by the lens assembly itself in the design and production process, thereby improving the design flexibility and production efficiency.

[0100] In one example embodiment, referring to Figures 1 to 5 As shown, an electronic device, a lens assembly, and an optical adjustment device 30 thereof are provided. The lens assembly can include an imaging element 10 and a fixed focus lens group 20. The fixed focus lens group 20 can include at least two fixed focus lenses, and two adjacent fixed focus lenses can be respectively denoted as a first lens 21 and a second lens 22.

[0101] In the embodiment, the optical adjustment device 30 can be arranged between the imaging element 10 and the fixed focus lens group 20, and is denoted as a first optical adjustment device 30. The optical adjustment device 30 can also be arranged between the first lens 21 and the second lens 22, and is denoted as a second optical adjustment device 30.

[0102] In the embodiment, the first optical adjustment device 30 adjusts the position of the first adjustment member 31 relative to the second adjustment member 32 along the bisector of the first right angle, thereby achieving focusing of the lens assembly. The second optical adjustment device 30 adjusts the position of the first adjustment member 31 relative to the second adjustment member 32 along the bisector of the first right angle, thereby achieving zooming of the lens assembly.

[0103] The optical adjustment device 30 in the embodiment has a simple structure, a single movement mode, low cost, and a relatively low technical threshold. Moreover, focusing and zooming can be achieved by adjusting the positions of two reflecting surfaces in the first adjustment member 31 of the corresponding optical adjustment device 30, thereby completely avoiding cumulative errors caused by multi-component transmission. In addition, the optical adjustment device 30 in the embodiment can be separated from the lens assembly and implemented as a separate device, thereby improving the design flexibility and production efficiency in the design and production process without being affected by the lens itself.

[0104] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order

[0105] Although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0106] The above descriptions are only specific embodiments of the present application to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features sought to be applied herewith.

Claims

1. An optical adjustment device applied to a lens assembly, characterized in that, The optical adjustment device comprises a first adjustment member and a second adjustment member, the first adjustment member comprises a first reflecting surface and a second reflecting surface, the second adjustment member comprises a third reflecting surface and a fourth reflecting surface, the first adjustment member is movably arranged relative to the second adjustment member, the first reflecting surface and the second reflecting surface are perpendicular to each other, the first reflecting surface and the third reflecting surface are parallel to each other, and the second reflecting surface and the fourth reflecting surface are parallel to each other, wherein a right angle formed by the intersection of the first reflecting surface and the second reflecting surface is referred to as a first right angle, and a right angle formed by the intersection of the third reflecting surface and the fourth reflecting surface is referred to as a second right angle, and a bisector of the first right angle coincides with a bisector of the second right angle; In the optical adjustment device, light is transmitted from the direction of the optical axis to the first reflecting surface, is reflected by the first reflecting surface and then transmitted to the third reflecting surface, is reflected by the third reflecting surface and then transmitted to the fourth reflecting surface, is reflected by the fourth reflecting surface and then transmitted to the second reflecting surface, and is transmitted along the direction of the optical axis after being reflected by the second reflecting surface. The optical adjustment device is configured to realize focusing or zooming of the lens assembly by adjusting the position of the first adjustment member relative to the second adjustment member along the bisector of the first right angle.

2. The optical adjustment device of claim 1, wherein, The first adjustment member comprises a first plane mirror and a second plane mirror which are perpendicular to each other, one side of the first plane mirror facing the third reflecting surface constitutes the first reflecting surface, and one side of the second plane mirror facing the fourth reflecting surface constitutes the second reflecting surface.

3. The optical adjustment device of claim 1, wherein, The second adjustment member comprises a right-angle prism, one side of the right-angle prism parallel to and facing the first reflecting surface constitutes the third reflecting surface, and one side of the right-angle prism parallel to and facing the second reflecting surface constitutes the fourth reflecting surface.

4. The optical adjustment device of claim 1, wherein, The optical adjustment device comprises a driving device for driving the movement of the first adjustment member relative to the second adjustment member along the bisector of the first right angle.

5. The optical adjustment device of claim 4, wherein, The driving device is any one of the following: an electromagnetic driving device, an ultrasonic motor driving device, a piezoelectric driving device, and a shape memory alloy driving device.

6. The optical adjustment device of claim 5, wherein, When the driving device is an electromagnetic driving device, the electromagnetic driving device is any one of the following: a spring piece type electromagnetic driving device, a ball type electromagnetic driving device, and a slide rod type electromagnetic driving device.

7. The optical adjustment device according to any of claims 1 to 6, characterized in that The optical adjustment device comprises a closed-loop feedback system configured to realize focusing or zooming of the lens assembly by controlling the position adjustment process of the first adjustment member relative to the second adjustment member along the bisector of the first right angle.

8. The optical adjustment device of claim 7, wherein, The closed-loop feedback system comprises a sensor and a controller electrically connected to the sensor. The sensor is configured to detect displacement information and position information of the first adjustment member relative to the second adjustment member along the bisector of the first right angle. The controller is configured to control the driving device to drive the first adjustment member to move relative to the second adjustment member along the bisector of the first right angle according to the displacement information and the position information of the first adjustment member relative to the second adjustment member. The controller is configured to control the first adjusting member to adjust the position relative to the second adjusting member based on the displacement information and the position information detected by the sensor.

9. A lens assembly, characterized by, The lens assembly comprises an imaging element and a fixed focus lens group, wherein, The imaging element and the fixed focus lens group are provided with the optical adjusting device as claimed in any one of claims 1-8, which is referred to as a first optical adjusting device, and the first optical adjusting device adjusts the position of the first adjusting member relative to the second adjusting member along the bisector of the first right angle to achieve focusing of the lens assembly. And / or, The fixed focus lens group comprises a first lens and a second lens, and the first lens and the second lens are provided with the optical adjusting device as claimed in any one of claims 1-8, which is referred to as a second optical adjusting device, and the second optical adjusting device adjusts the position of the first adjusting member relative to the second adjusting member along the bisector of the first right angle to achieve zooming of the lens assembly.

10. An electronic device, comprising: The electronic device comprises the lens assembly as claimed in claim 9.

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